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Linux Kernel "Dirty Frag" 本地权限提升高危漏洞风险通告QVD-2026-24699

  • 2026-06-27 21:36:11
Linux Kernel "Dirty Frag" 本地权限提升高危漏洞风险通告QVD-2026-24699
  • 漏洞名称
    Linux Kernel “Dirty Frag”
  • 漏洞等级
    高风险
  • 影响版本
    包括 Ubuntu 24.04.4、Red Hat Enterprise Linux 10、CentOS 10 等操作系统
  • 排查方案

1. 检查模块是否已加载

lsmod | grep -E 'esp4|esp6|rxrpc'

2. 检查模块是否为内置(决定缓解措施中的 modprobe 黑名单是否有效)

grep -E 'CONFIG_INET_ESP|CONFIG_RXRPC' /boot/config-$(uname -r)

=y 为内置,黑名单无效;=m 为模块,黑名单有效

3. 检查 User Namespace 是否允许(影响 ESP 变体)

cat /proc/sys/kernel/unprivileged_userns_clone

# 1 = 允许(ESP 变体可能可利用);0 = 阻止

缓解措施

(1) 将 esp4、esp6、rxrpc 三个模块加入 modprobe 黑名单,阻止自动加载,并立即卸载已加载的模块(如果当前未被使用)

sudo sh -c "printf 'install esp4 /bin/false\ninstall esp6 /bin/false\ninstall rxrpc /bin/false\n' > /etc/modprobe.d/dirtyfrag.conf"sudo rmmod esp4 esp6 rxrpc 2>/dev/null ||true

注:该缓解措施可能会中断 IPsec(VPN)和 RxRPC(AFS 文件系统)。

同时,建议在未运行过漏洞 EXP 的机器上执行该缓解措施,否则可能会存在缓解措施失效的情况。

(2) 通过 sysctl 限制非特权用户创建 User Namespace 来阻断 ESP 变体

sysctl -w user.max_user_namespaces=0

注:该缓解措施会影响容器运行时(Docker、Podman 等依赖 User Namespace 的容器运行时),建议仅在非容器环境中使用。

漏洞参考

https://github.com/V4bel/dirtyfrag

xfrm-ESP Page-Cache Write 漏洞已被分配 CVE-2026-43284,并在主线代码库中修复,修复提交记录位于f4c50a4034e6。
RxRPC Page-Cache Write 漏洞已被保留为 CVE-2026-43500 以便跟踪;目前任何树中都没有补丁。

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  1. 请求信息 : 2026-07-03 19:17:48 HTTP/2.0 GET : https://f.mffb.com.cn/a/492202.html
  2. 运行时间 : 0.180066s [ 吞吐率:5.55req/s ] 内存消耗:4,461.08kb 文件加载:140
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=16527b6cdcabfb0babb49249297a73e6
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  138. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/vendor/topthink/think-template/src/template/contract/DriverInterface.php ( 0.86 KB )
  139. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/runtime/temp/067d451b9a0c665040f3f1bdd3293d68.php ( 11.98 KB )
  140. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
  1. CONNECT:[ UseTime:0.000450s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000628s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000252s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000292s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000491s ]
  6. SELECT * FROM `set` [ RunTime:0.006355s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000638s ]
  8. SELECT * FROM `article` WHERE `id` = 492202 LIMIT 1 [ RunTime:0.017433s ]
  9. UPDATE `article` SET `lasttime` = 1783077468 WHERE `id` = 492202 [ RunTime:0.001060s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000292s ]
  11. SELECT * FROM `article` WHERE `id` < 492202 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001947s ]
  12. SELECT * FROM `article` WHERE `id` > 492202 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.010667s ]
  13. SELECT * FROM `article` WHERE `id` < 492202 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.009705s ]
  14. SELECT * FROM `article` WHERE `id` < 492202 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.035467s ]
  15. SELECT * FROM `article` WHERE `id` < 492202 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.028297s ]
0.181677s